21.06.2009

Mammoet to launch PTC120DS

Dutch based heavy lifting company Mammoet has unveiled plans for a new 100,000 tonne/metre plus version of its Platform ringer Twin boom Containerised (PTC) crane – the PTC-120DS.

The massive crane will lift 3,000 tonnes to 48 metres, 2,000 tonnes to 53 metres and 1,000 tonnes to almost 100 metres radius.
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The preliminary drawings of the new PTC120

The main boom is up to 130 metres plus a job of up to 43 metres, the crane has a footprint of 45 metre diameter circle.

The new crane will clearly go head to head on big projects with the big lifting machines launched last year by Abnormal Load Engineering (ALE) the SK90 and SK120. The PTC though is designed fully to mobile crane standards with 360 hoists and 360 degree slew in normal configuration. Whereas the ALE machine and Mammoet’s own MSG cranes, use strand jacks and which are considerably slower.

The hoist speeds on the PTC 120 are two metres a minute for the largest winch which can cope with up to 3,200 tonnes and five metres a minute on the smaller ‘runner’ hoist which can cope with loads of up to 250 tonnes.

Slewing is via normal crane type rollers with 360 degrees taking 30 minutes – fast for this size of lifting machine. The crane can also be rigged to run on straight tracks.
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The PTC120 uses a traditional ringer with rollers for slewing

The crane which is still in design can self erect its own boom, allowing it to lower the boom in case of severe winds – the 60 metre back mast which requires a 300 tonne crawler crane to erect, can withstand 150mph out of service speeds.

To see the ALE SK90 click here

The new PTC substantially outperforms its own PTC and MSG heavy lift cranes, and the following is a rough indication of how the Mammoet will stack up against the ALE SK models, which are equipped with almost 1,000 tonnes more counterweight.
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Mammoet's PTCIII in a typical application

Given the fact that the ALE machine does not have a traditional slew ring, the company uses outreach rather than radius. This being the distance from the heel pin of the boom. Using this as a basis results in the following comparison.

Radius ---Outreach--- Mammoet –- ALE --- ALE
metres----metres-------PTC120 ---- SK90----SK120
48----------27.5--------- 3000 --------3152---- 4518
54----------33.5--------- 2000 --------2793 --- 3750
98----------77.5--------- 1000 --------1005 --- 1682
122-------101.5--------- 500 ----------573 ---- 1079

The original side by side that we published was as follows, and simply took the points where the Mammoet lifted 3,000, 2,000, 1,000 and 500 tonnes. We do aknowledge that the ALE method is more of a practical comparison.

Radius Maximum capacity
------------ Mammoet PTC120 ---- ALE SK90---- ALE SK120
48 metres --- -3,000 tonnes-- 1,911 tonnes---2,826 tonnes
53/54 metres--2,000 tonnes-- 1,601 tonnes---2,409 tonnes
98 metres------1,000 tonnes-- 700 tonnes---- 900 tonnes
122 metres-------500 tonnes-- 281 tonnes-----650 tonnes

Either way these are very impressive lifting machines.